SMF 92 subtype 11 is usually useful in showing USS file activity, which can tend to reveal if anything 'odd' is going on with file based activity. I/O is also seen when network activity is involved, but I have not found 92's very useful in determining what is going on in that arena, but others may have had success. Note that if you are not already collecting 92's, some subtypes can generate enormous amounts of SMF records, so we choose to NOTYPE on 92(10,16,17)
On Mon, 17 May 2021 at 22:31, David Crayford <dcrayf...@gmail.com> wrote: > On 18/05/2021 2:05 am, Kirk Wolf wrote: > > Sorry, I meant to add that agree with David. If you have big Java > > apps that use significant CPU, you really need to run them on zIIP or > > the costs will be intolerable. > > > > In the particular case of the large Australian customer, I wonder why > > they didn't see the issue coming early on? > > > Good question. It's my understanding that they did indeed plan for > growth but the workload surpassed capacity planning. The application was > a customer facing mobile application and mobile workloads have shocked a > lot of mainframe customers over the last decade. > There is a ratio of the maximum number of zIIPs tied to the number of > GCPs. This used to be 1:1 but I believe it is now 2:1. IIRC, they also > added a caching layer to optimize the application. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
